Vista - blue screen of death and rebooting

Hi,
ive had my computer for 6 months, and now its keeps rebooting every 1-2days. These reboots can be in the middle of using the internet, running a virus scan, or doing nothing at all.
When the computer crashes i get the blue screen with "bad_pool_caller", but this only stays on for a second, then it proceeds to reboot. (the next time it should stay up longer, ive disabled the reboot option). After the resart vista gives me info on the crash, which i will post with the dump files.

Memoray and chkdsk come up fine, with no errors. The computer clean and not overheating. Any help on why this keeps happening would be greatly appreciated. This has happened 3 times in the past 3 days, but i only got the crash info twice (sry), but ive got 4dmp files - no idea why but there all posted.

ummm, im unsure- how would i tell?
ps now my computer wont load i can switch the computer on, and it loads then a blank screen. i dont know if this is connected, but any ideas would be greatful.
Many Thanks,
-Mik

If you can get the computer to run long enough, download the free Memtest86 and run it for four hours or seven passes. That will verify whether it is a memory problem.
The fact that the problem does not occur in safe mode implies that it is some sort of software issue or perhaps an infestation. You might want to download the latest edition of Hi Jack This, and post the results to the experts on this forum.
It could also be something simple, like a memory module that needs to be reseated, and other possibilities such as inadequate (or too much) thermal past between the cpu and heatsink, a defective driver, and so on. Trouble shooting sometimes takes a long time.
Reseat all your cables and memory modules, carefully, then go to your Device Manager (Start->Control Panel->System->Hardware->Device Manager) and look for any red or yellow flags.
You can also take a look at the event viewer (Start->Control Panel->Administrative Tools->Computer Management->Event Viewer, and look for significant red or yellow flags in those lists that are repeated at about the same time you get the errors, which are actually memory dumps.
You may have a video graphics card driver error, so download the latest one and replace the one now installed.
This is only a partial list.
Good luck. Let us know what you learn.

What kimsland said. I had to replace my RAM because I was experiencing what you are: Crashes before even it booted fully and then reboot.

MemTest is a great test but it is not perfect. Let it run for a minimum of 7 to 10 passes. This takes a long time. If you get errors you have corrupted memory (RAM) and then if you have more than one stick of RAM you should run this test on each individual stick.